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Add clubb_a_const into the namelist. - #1676

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@HingOng

@HingOng HingOng commented Sep 15, 2026

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This PR adds clubb_a_const into the namelist.

Before this change, a_const = 1.8 was set in src/physics/clubb/src/CLUBB_core/parameters_tunable.F90, and it could be reset with SourceMods.

After this change, a_const = 1.8 is set in bld/namelist_files/namelist_defaults_cam.xml, and it can be reset with user_nl_cam.

My 5-day run results appear BFB.

Setting a_const may be useful for tuning the lowest-level wind speed, as shown in Section 4.1 of https://doi.org/10.22541/essoar.177135891.11467584/v3

@cacraigucar
cacraigucar self-requested a review September 15, 2026 15:20
@cacraigucar cacraigucar self-assigned this Sep 15, 2026
@cacraigucar cacraigucar added the misc tag issue or PR candidate for upcoming misc tag label Sep 15, 2026
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